/*
 * ! Ext JS Library 3.0.0 Copyright(c) 2006-2009 Ext JS, LLC licensing@extjs.com
 * http://www.extjs.com/license
 */

/* Fix for Opera, which does not seem to include the map function on Array's */
if (!Array.prototype.map) {
	Array.prototype.map = function(fun) {
		var len = this.length;
		if (typeof fun != 'function') {
			throw new TypeError();
		}
		var res = new Array(len);
		var thisp = arguments[1];
		for (var i = 0; i < len; i++) {
			if (i in this) {
				res[i] = fun.call(thisp, this[i], i, this);
			}
		}
		return res;
	};
}

Ext.ns('Ext.ux.data');

/**
 * @class Ext.ux.data.PagingMemoryProxy
 * @extends Ext.data.MemoryProxy
 *          <p>
 *          Paging Memory Proxy, allows to use paging grid with in memory
 *          dataset
 *          </p>
 */
Ext.ux.data.PagingMemoryProxy = Ext.extend(Ext.data.MemoryProxy, {
			constructor : function(data) {
				Ext.ux.data.PagingMemoryProxy.superclass.constructor.call(this);
				this.data = data;
			},
			doRequest : function(action, rs, params, reader, callback, scope,
					options) {
				params = params || {};
				var result;
				try {
					result = reader.readRecords(this.data);
				} catch (e) {
					this.fireEvent('loadexception', this, options, null, e);
					callback.call(scope, null, options, false);
					return;
				}

				// filtering
				if (params.filter !== undefined) {
					result.records = result.records.filter(function(el) {
								if (typeof(el) == 'object') {
									var att = params.filterCol || 0;
									return String(el.data[att])
											.match(params.filter)
											? true
											: false;
								} else {
									return String(el).match(params.filter)
											? true
											: false;
								}
							});
					result.totalRecords = result.records.length;
				}

				// sorting
				if (params.sort !== undefined) {
					// use integer as params.sort to specify column, since
					// arrays are not named
					// params.sort=0; would also match a array without columns
					var dir = String(params.dir).toUpperCase() == 'DESC'
							? -1
							: 1;
					var fn = function(r1, r2) {
						return r1 < r2;
					};
					result.records.sort(function(a, b) {
								var v = 0;
								if (typeof(a) == 'object') {
									v = fn(a.data[params.sort],
											b.data[params.sort])
											* dir;
								} else {
									v = fn(a, b) * dir;
								}
								if (v == 0) {
									v = (a.index < b.index ? -1 : 1);
								}
								return v;
							});
				}
				// paging (use undefined cause start can also be 0 (thus false))
				if (params.start !== undefined && params.limit !== undefined) {
					result.records = result.records.slice(params.start,
							params.start + params.limit);
				}
				callback.call(scope, result, options, true);
			}
		});

// backwards compat.
Ext.data.PagingMemoryProxy = Ext.ux.data.PagingMemoryProxy;
